Army Men: Green Rogue

Invisibility:
During gameplay, press Start then press R1, R2, Square, Triangle, L1.

Weapons:
Try to get the Bazooka and the Flamethrower's power to maximum. Use the Bazooka as your main weapon. It can blow up obstacles as well as cause heavy damage. If you find yourself unable to kill an enemy near you, you can quickly change to the Flamethrower and melt them, then change back to the Bazooka.